It seems almost like there are two camps with the Allante, those that are on the 87-92 side of the fence, and those that are on the 93 side. Many argue that in typical GM fashion, GM "cheapened" the Allante in its final year of production despite giving the wonderful Northstar engine. For example the pre 93 has the true expensive Recaro seats where the 93 has the standard GM issue softies. Wheel caps on the 93 are plastic where they might be metal on those before... Honestly? I dont think it really matters.
The difference of the Northstar is enough to make up for those small differences IMO. Additionally, the interior and some of the exterior of the 93 just LOOKS more modern and pleasing to the eye in some respects. Those seats for example, despite being regular GM seats, are more modern looking and really the truth is overall its the same great car. My preference (not that it matters), a 1993 in White Diamond with Chrome Wheels. Hell yes.
Another point on Allantes, they seem to be GAINING value rather than losing it like most domestic cars of the same era. Check
THIS out, this car may be in tip-top shape, but this guy is asking 34 grand for it, rediculous, but someone just might pay it.